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ID:34385177
大小:93.84 KB
页数:54页
时间:2019-03-05
《internet engineering task force k. k. ramakrishnan internet draft teraoptic networks》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、InternetEngineeringTaskForceK.K.RamakrishnanINTERNETDRAFTTeraOpticNetworksdraft-ietf-tsvwg-ecn-00.txtSallyFloydACIRID.BlackEMCNovember,2000Expires:May,2001TheAdditionofExplicitCongestionNotification(ECN)toIPStatusofthisMemoThisdocumentisanInternet-DraftandisinfullconformancewithallprovisionsofS
2、ection10ofRFC2026.Internet-DraftsareworkingdocumentsoftheInternetEngineeringTaskForce(IETF),itsareas,anditsworkinggroups.NotethatothergroupsmayalsodistributeworkingdocumentsasInternet-Drafts.Internet-Draftsaredraftdocumentsvalidforamaximumofsixmonthsandmaybeupdated,replaced,orobsoletedbyotherdo
3、cumentsatanytime.ItisinappropriatetouseInternet-Draftsasreferencematerialortocitethemotherthanas"workinprogress."ThelistofcurrentInternet-Draftscanbeaccessedathttp://www.ietf.org/ietf/1id-abstracts.txtThelistofInternet-DraftShadowDirectoriescanbeaccessedathttp://www.ietf.org/shadow.html.Abstrac
4、tThisdocumentspecifiestheincorporationofECN(ExplicitCongestionNotification)toTCPandIP,includingECN'suseoftwobitsintheIPheader'sDSfield.WebeginbydescribingTCP'suseofpacketdropsasanindicationofcongestion.Nextweexplainthatwiththeadditionofactivequeuemanagement(e.g.,RED)totheInternetinfrastructure,
5、whereroutersdetectcongestionbeforethequeueoverflows,routersarenolongerlimitedtopacketdropsasanindicationofcongestion.RouterscaninsteadsettheCongestionExperienced(CE)bitintheIPheaderofpacketsfromECN-capabletransports.WedescribewhentheCEbitistobesetinrouters,andRamakrishnanandFloydProposedStandar
6、d[Page1]draft-ietf-tsvwg-ecn-00AdditionofECNtoIPNovember2000describemodificationsneededtoTCPtomakeitECN-capable.Modificationstoothertransportprotocols(e.g.,unreliableunicastormulticast,reliablemulticast,otherreliableunicasttransportprotocols)couldbeconsideredasthoseprotocolsaredevelopedandadvan
7、cethroughthestandardsprocess.WealsodescribeinthisdocumenttheissuesinvolvingtheuseofECNwithinIPtunnels,andwithinIPsectunnelsinparticular.Oneoftheguidingprinciplesforthisdocumentisthatallthemechanismsspecifiedhereareincrementallydep
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